WO2011157926A1 - Nacelle de turboreacteur - Google Patents
Nacelle de turboreacteur Download PDFInfo
- Publication number
- WO2011157926A1 WO2011157926A1 PCT/FR2011/051304 FR2011051304W WO2011157926A1 WO 2011157926 A1 WO2011157926 A1 WO 2011157926A1 FR 2011051304 W FR2011051304 W FR 2011051304W WO 2011157926 A1 WO2011157926 A1 WO 2011157926A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel
- nacelle
- zone
- flow
- wall
- Prior art date
Links
- 239000000463 material Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 230000005465 channeling Effects 0.000 claims description 3
- 239000011358 absorbing material Substances 0.000 claims 1
- 238000007664 blowing Methods 0.000 description 23
- 239000000446 fuel Substances 0.000 description 4
- 210000003462 vein Anatomy 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 210000003850 cellular structure Anatomy 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000036555 skin type Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/28—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto using fluid jets to influence the jet flow
- F02K1/34—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto using fluid jets to influence the jet flow for attenuating noise
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
- F02C3/13—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor having variable working fluid interconnections between turbines or compressors or stages of different rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/045—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for noise suppression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/16—Control of working fluid flow
- F02C9/18—Control of working fluid flow by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
- F02K3/077—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type the plant being of the multiple flow type, i.e. having three or more flows
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
- B64D2033/0206—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes comprising noise reduction means, e.g. acoustic liners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
- B64D2033/0266—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes specially adapted for particular type of power plants
- B64D2033/0286—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes specially adapted for particular type of power plants for turbofan engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/96—Preventing, counteracting or reducing vibration or noise
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- the present invention relates to a turbojet engine nacelle. It relates more particularly to a nacelle comprising at least one nacel element having a wall delimiting a main flow channel, said channel having a variable flow passage section with at least a first channel zone whose section of passage is greater than that of at least one second zone of the channel.
- An aircraft is driven by several turbojets each housed in a nacelle also housing a set of ancillary actuators related to its operation and providing various functions when the turbojet engine is in operation or stopped.
- These ancillary actuating devices comprise in particular a mechanical system for actuating thrust reversers.
- a nacelle N generally has a tubular structure comprising an air inlet section SE1 upstream of the turbojet engine (not shown), a median section SE2 intended to surround a fan S of the turbojet engine, a downstream section SE3 generally housing thrust reverser means and intended to surround the combustion chamber of the turbojet, and is generally terminated by an outlet section SE4 whose output is located downstream of the turbojet engine.
- the air intake section SE1 is in the form of an input structure element 1 of the nacel N, s itu é am have turbojet engine and blower S of the turbojet, and this element of input structure 1 has an inner tubular wall 10 delimiting an inlet channel 1 1 of air in the n-boat.
- the median section SE2 is in the form of a median structure element 2, located upstream of the turbojet engine and surrounding the fan S, and this median structure element 2 has an internal tubular wall 20 delimiting, with the fan S, a annular channel 21 of air circulation.
- the downstream section SE3 comprises two concentric downstream structure elements 30, 31 situated in front of the turbojet, namely:
- This downstream external structural element 30 has an internal tubular wall 32 and this downstream internal structural element 31 has an outer annular wall 33, where these tubular walls 32 and 33 delimit between them an annular flow channel 34, also called a vein, intended to channel the flow of cold air flowing outside the turbojet engine.
- OFS Outer Fixed Structure
- IFS Inner Fixed Structure
- the turbojet engine of the double flow type generates, by means of the blades of the fan S, a rotation of a hot air flow (also called primary flow) coming from the combustion chamber of the turbojet engine, and an air flow. cold (secondary flow) flowing outside the turbojet in the annular flow channel 34.
- a hot air flow also called primary flow
- an air flow cold (secondary flow) flowing outside the turbojet in the annular flow channel 34.
- the outlet section SE4 comprises at least one gas ejection nozzle element 4 situated downstream of the turbojet engine, where this nozzle element 4 comprises at least one annular wall 40 delimiting an outlet channel 41 from the exhaust air.
- this nozzle element 4 comprises at least one annular wall 40 delimiting an outlet channel 41 from the exhaust air.
- the primary and secondary flows are not mixed, that is to say that they are separated at the output and circulate respectively in primary and secondary nozzle elements.
- the primary and secondary flows are mixed downstream of the engine within a common nozzle element.
- FIG. 2 illustrates an example of acoustic attenuation panel 5, of the sandwich composite panel type, comprising:
- a structuring skin 50 of the so-called “full” air-impermeable skin type, fixed against the wall of the nacelle element concerned;
- a perforated skin 51 of the so-called “acoustic" air-permeable skin type, at least partially delimiting the flow channel in this nacelle element;
- Such panels are acoustic resonators capable of "trapping" the noise and thus to reduce noise emissions towards the outside of the nacelle.
- the core 52 is made of honeycomb-like cellular structure material.
- This material comprises a plurality of cellular cells delimited by side walls, each cellular cell communicating with these neighbors.
- Such panels with cellular structure are already known, in particular international applications WO 2008/1 13904 and WO 2009/066036, and will not be described in more detail.
- the core is made of a porous material, being understood by "porous material” as a constant surface (that is, having many communicating cavities) in the form of foam, or in foamed form, or in the form of felt, or in the form of an aggregate of small elements such as balls.
- some of the channels mentioned above have a variable flow passage section with at least a first channel zone whose passage section is greater than that of at least a second zone of the canal. Since the distribution of the pressure in a channel depends on the section of flow passage, these channels have areas of high pressure (associated with large passage sections) and areas of low pressure (associated with weak passage sections).
- FIG. 3 illustrates the evolution of the section A (in m 2 ) of passage of the flow in the inlet channel 1 1 as a function of the longitudinal position X (in cm) along the median axis AA ' of the n-boat.
- a first zone Z1 of small section close to the neck C air inlet, corresponding to a zone of low pressure and high speed operating on the aircraft;
- FIG. 4 illustrates on the curves C1 to C3 several examples of the evolution of the section A, reported on the Acol section taken at the level of the neck C, of the passage of the flow in an annular channel as a function of the longitudinal position X (in m) along the median axis AA 'of the nacelle N.
- the curves Rint and Rext illustrate the evolution of the internal and external radii of the annular channel in question as a function of the longitudinal position X. at least two distinct zones Z1, Z2, namely:
- a first zone Z1 of small section corresponding to a zone of low pressure and high speed in operation on the aircraft
- a second zone Z2 of large section corresponding to a zone of high pressure and low speed in operation on the aircraft.
- This annular channel may be located in the downstream section SE3 or the outlet section SE4 of an n-boat.
- this annular channel may correspond to the annular channel 34, or vein, situated between the downstream external structural element 30 ( Outer Fixed Structure) and the downstream internal structure element 31 (Inner Fixed Structure).
- This annular channel may also be located in a nozzle member, such as in a primary or secondary nozzle member for a separate flow nacelle, or in a common nozzle member for a mixed flow nacelle.
- the patent application US 2009/140104 A1 discloses a nacelle comprising blowing means for injecting a tangential air flow into the internal volume of the nacelle, where these blowing means comprise at least one air intake duct adapted to take the tangential air flow at the turbojet compressor, in order to guide the flow of air flow in the nacelle, so as to be maintained parallel to the axis longitudinal section of the nacelle and to eliminate any air thread detachment in the nacelle.
- Patent Application EP 1 517 022 A2 discloses a turbojet noise attenuation method of increasing the speed of the flow locally, reducing the boundary layer and the associated turbulence and optimizing the refraction and absorption of sound with an acoustic covering , where the increase of this speed can be provided by means of a bypass pipe which sucks and blows air into the platform by differential pressure.
- US Patent Application 3,572,960 A discloses the introduction of one or more ducts inside a fan cowl between output straightening fins and inlet guide vanes disposed in the duct. main flow, to remove at least substantially the wakes at the trailing edges of the inlet guide vanes, and thus reduce the noise.
- the present invention aims to solve at least in part the aforementioned drawbacks by providing a nacelle in which the frictional pressure losses on the walls defining the channels of the nacelle, are reduced.
- a turbojet engine nacelle comprising at least one nacelle element having a wall delimiting a main flow channel, said channel having a variable flow passage section with at least a first zone of the channel whose passage section is greater than that of at least one second zone of the channel, said nacelle further comprising at least one secondary flow conduit establishing a fluid connection between the first zone and the second channel zone in parallel with said channel, remarkable in that the wall of the nacelle element is covered, at least partially, by an acoustic attenuation panel extending in the first and second zones of the channel, said panel comprising:
- a perforated skin at least partially delimiting the channel
- a core interposed between the structuring skin and the perforated skin said core being made of an acoustic absorption material of the type having numerous internal cavities;
- the or each duct has, on the one hand, a first end passing through the structuring skin in the first zone of the canal and, on the other hand, a second end passing through the structuring skin in the second zone of the channel, in order to establish the secondary flow in the conduit via the core and the perforated skin of the acoustic attenuation panel.
- a secondary flow is obtained from the first zone to the second zone with:
- the blowing in the second zone advantageously makes it possible to reduce the coefficient of friction of the boundary layer in this second zone, thus reducing the friction losses.
- the flow of air flowing in the duct or ducts can also improve the cooling of the structure of the nacelle in the case where the air taken in the first zone or zones is cold. .
- the duct or ducts define, on the one hand, in the first zone of the channel an inlet surface of the secondary flow and, on the other hand, in the second zone of the channel, an exit surface of the secondary flow, where the entrance surface is larger than that of the exit surface.
- suction in the first zone will, on the other hand, increase the coefficient of friction of the boundary layer in this first zone. zone, thus increasing friction losses.
- the invention makes it possible to reduce friction losses in the second zone or zones and to increase friction losses in the first zone or zones.
- the suction speed in the first zone or zones must be as low as possible so as to limit the increase in the coefficient of friction in these first suction zones;
- the blowing speed in the second zone or zones must be as strong as possible so as to reduce as much as possible the coefficient of friction in these second blast zones, which are also zones with a high flow velocity in the channel and so high drag.
- suction surface greater than the blowing surface, in other words that the inlet surface of the secondary flow is greater in area than the area of the outlet surface of the outlet. secondary flow.
- the ratio between the surface area of the entrance surface and the surface area of the exit surface is greater than 2, and preferably of the order of 4.
- a ratio of 4 in other words a ratio of approximately 80% / 20% between these areas, is particularly suitable for nacelles.
- the core of the acoustic attenuation panel has at least one inner wall disposed between the first end and the second end of the duct or conduits in order to establish the tightness of the core between the first zone and the second one. zone of the channel, thus advantageously providing a secondary flow in the duct or ducts, and not on the length of the soul.
- the acoustic absorption material of the core of the acoustic attenuation panel is of the honeycomb structural material type, especially honeycomb, or porous material.
- the or each nacelle element can be chosen from the following elements:
- downstream external structure element situated downstream of the fan and surrounding the turbojet, said downstream outer structural element having an internal tubular wall delimiting, with a downstream internal structural element, an annular flow channel intended to channel the flow cold air circulating outside the turbojet engine;
- downstream internal structural element located downstream of the fan and surrounding the turbojet, said downstream internal structural element having an outer annular wall defining, with the outer downstream structural element, an annular flow channel for channeling the cold air flow circulating outside the turbojet engine;
- - Ejection nozzle element located downstream of the turbojet engine; said nozzle element having at least one annular wall defining an air outlet channel out of the nacelle.
- conduits in several structural elements of the nacelle, just as it is possible to provide one or a plurality of conduits for the same channel.
- FIG. 1 is a schematic view in longitudinal section of a nacelle of known type
- FIG. 3 is a graph illustrating the evolution of the passage section A of the flow in a nacelle inlet duct as a function of the longitudinal position X, with a schematic illustration at the top and right of this nacelle inlet channel;
- FIG. 4 is a graph illustrating several evolution curves of the section A, reported on a section Acol taken at the level of the neck C of an annular channel (or vein) of a nacelle, passage of the flow in this annular channel of the nacelle according to the longitudinal position X, and the evolution of the internal and external radii this annular channel as a function of the longitudinal position X;
- FIG. 5 is a schematic longitudinal sectional view of a nacelle according to the invention.
- FIG. 6 is an enlarged view of the zone VI of FIG. 5;
- FIG. 7 is a schematic perspective view of a known acoustic attenuation panel with a honeycomb structure for a nacelle according to the invention, illustrating the suction and the blowing in the first and second zones of a channel;
- FIG. 8 is a graph illustrating several curves as a function of the suction speed by a duct in a second zone of a channel of a nacelle according to the invention, these curves illustrating the evolution of the coefficient of friction Cf in this second zone as a function of the longitudinal position X;
- FIG. 9 is a graph illustrating several curves as a function of the blowing speed by a duct in a first zone of a channel of a nacelle according to the invention, these curves illustrating the evolution of the coefficient of friction Cf in FIG. this first zone as a function of the longitudinal position X;
- FIG. 1 is a graph illustrating the evolution of the radius of the various inner / outer walls of the primary / secondary channels as a function of the longitudinal position X;
- FIG. 1 1 is a graph illustrating the evolution of mach according to the longitudinal position X for an inner wall and an outer wall of an annular channel equipped with a conduit according to the invention.
- a nacelle according to the invention is described with reference to FIGS 5 to 7.
- This nacelle comprises at least one nacelle element having a wall delimiting a main flow channel, where this channel has a variable section of passage of the flow with at least a first zone Z1 of the channel whose passage section is greater than that of at least a second zone Z2 of the channel.
- These nacelle elements have already been described above, namely the input structure element 1, the median structure element 2, the downstream external structural element 30, downstream internal structural element 31 and the the nozzle elements 4, such as, for example, the primary and secondary nozzle elements for a nacelle with separate streams and the common nozzle element for a mixed flow nacelle.
- the downstream internal structural element 31 called Inner Fixed Structure (IFS), which has a wall with an outer tubular wall 33 delimiting, with the internal annular wall, is chosen.
- IFS Inner Fixed Structure
- 32 of the outer downstream structural element 30 the annular flow channel 34.
- the other elements 1, 2, 30 and 4 could have been chosen to describe and illustrate the invention.
- This annular channel 34 has two zones Z1, Z2 of distinct sections, namely:
- a first zone Z1 of small section corresponding to a zone of low pressure and high speed in operation on the aircraft
- a second zone Z2 of large section corresponding to a zone of high pressure and low speed in operation on the aircraft.
- this nacelle further comprises at least one secondary flow duct 6 establishing a fluid connection between the first zone Z1 and the second zone Z2 of the channel 34 in parallel with this channel 34.
- the nacelle may comprise a plurality of secondary flow conduits 6 establishing a fluid connection between the first zone Z1 and the second zone Z2 of the channel 34 in parallel with this channel 34.
- An acoustic attenuation panel 5 is mounted on the outer tubular wall 33; this acoustic attenuation panel 5 being of the type already described above with a structuring skin 50, a perforated skin 51 and a core 52 made of an acoustic absorption material having numerous internal cavities.
- the or each duct 6 has two opposite ends, namely:
- the core 52 of the acoustic attenuation panel 5 has at least one inner wall 53 (shown schematically in FIG. 5) disposed between the first end and the second end of the duct or ducts in order to establish the tightness of the soul between the first zone and the second zone of the canal
- the secondary flow is established in the duct 6, from the first end 61 to the second end 62, via the web 52 and the holes of the perforated skin 51 of the panel of FIG. acoustic attenuation 5, with:
- FIG. 8 is a graph illustrating several CVO-CV5 curves illustrating the evolution of the coefficient of friction CF as a function of the longitudinal position X, the coefficient of friction CF being considered at the level of a wall delimiting a main flow channel, in a second zone (or blow zone) of this channel.
- the CVO CV5 curves are functions of the blowing speed VS by a duct in this second zone of the channel, with:
- the reduction of the coefficient of friction CF with the blowing speed VS is reduced by about 50% for a blowing speed of 0.3 m / s (CV3 curve) with respect to a zero blowing speed (CVO curve).
- FIG. 9 is a graph illustrating several CVO 'to CV5' curves illustrating the evolution of the coefficient of friction CF as a function of the longitudinal position X, the coefficient of friction CF being considered at the level of a wall delimiting a flow channel in a first zone (or suction zone) of this channel.
- Curves CVO 'to CV5' are functions of the VA suction velocity through a duct in this first channel zone, with:
- the increase of the coefficient of friction CF with the suction speed VA is increased by about 15% for a suction speed of 0.06 m / s (curve CV3 ') with respect to a suction speed of zero (CVO' curve).
- the suction surface is greater than the blowing surface, so that the suction speed VA in the first zone Z1 is lower than the blowing speed VS in the second zone Z2, as shown schematically in FIGS. 6 and 7 with the arrows FA which symbolize the suction in the first zone Z1 and the arrows FS which symbolize the blowing in the second zone Z2.
- the inlet surface of the secondary flow is greater in area than the area of the outlet surface of the secondary flow (blowing surface).
- the ratio between the area of the entrance surface (or suction surface) and the area of the exit surface (blowing surface) is about 80% / 20% , ie of the order of 4.
- FIG. 11 is a graph illustrating the evolution of the mach (or Mach number) as a function of the longitudinal position X for an inner wall (CMint curve) and an outer wall (CMext curve) of an annular channel in order to illustrate the location of the first zone Z1 suction and the second zone Z2 blowing. It is estimated with the invention a specific consumption gain of about 0.2%; this gain of 0.2% being calculated from the overall decrease of the coefficient of friction which makes it possible to determine the gain in pressure drop in the annular channel. Then, an exchange coefficient makes it possible to calculate the equivalent in terms of gain of specific consumption.
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Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2013100181/11A RU2563297C2 (ru) | 2010-06-14 | 2011-06-09 | Гондола турбореактивного двигателя |
BR112012031432A BR112012031432A2 (pt) | 2010-06-14 | 2011-06-09 | nacela de motor turbojato |
CA2802008A CA2802008A1 (fr) | 2010-06-14 | 2011-06-09 | Nacelle de turboreacteur |
CN2011800280685A CN102933462A (zh) | 2010-06-14 | 2011-06-09 | 涡轮喷气发动机舱 |
EP11735460.5A EP2580121B1 (fr) | 2010-06-14 | 2011-06-09 | Nacelle de turboreacteur |
US13/713,750 US8757319B2 (en) | 2010-06-14 | 2012-12-13 | Turbojet engine nacelle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1054670 | 2010-06-14 | ||
FR1054670A FR2961175B1 (fr) | 2010-06-14 | 2010-06-14 | Nacelle de turboreacteur |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/713,750 Continuation US8757319B2 (en) | 2010-06-14 | 2012-12-13 | Turbojet engine nacelle |
Publications (1)
Publication Number | Publication Date |
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WO2011157926A1 true WO2011157926A1 (fr) | 2011-12-22 |
Family
ID=43502611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2011/051304 WO2011157926A1 (fr) | 2010-06-14 | 2011-06-09 | Nacelle de turboreacteur |
Country Status (8)
Country | Link |
---|---|
US (1) | US8757319B2 (fr) |
EP (1) | EP2580121B1 (fr) |
CN (1) | CN102933462A (fr) |
BR (1) | BR112012031432A2 (fr) |
CA (1) | CA2802008A1 (fr) |
FR (1) | FR2961175B1 (fr) |
RU (1) | RU2563297C2 (fr) |
WO (1) | WO2011157926A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3028290A1 (fr) * | 2014-11-12 | 2016-05-13 | Aircelle Sa | Ecope de prise d’air pour nacelle d’aeronef |
US9856745B2 (en) | 2012-02-28 | 2018-01-02 | United Technologies Corporation | Acoustic treatment in an unducted area of a geared turbomachine |
US10837367B2 (en) | 2012-02-28 | 2020-11-17 | Raytheon Technologies Corporation | Acoustic treatment in an unducted area of a geared turbomachine |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9758240B2 (en) * | 2014-04-25 | 2017-09-12 | Rohr, Inc. | Modular plenum and duct system for controlling boundary layer airflow |
US10971128B2 (en) * | 2015-04-10 | 2021-04-06 | Mra Systems, Llc | Acoustic liner and methods of constructing an acoustic liner |
WO2018037462A1 (fr) * | 2016-08-22 | 2018-03-01 | 株式会社Ihi | Revêtement insonorisant |
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FR3095674B1 (fr) * | 2019-05-03 | 2021-04-16 | Safran Aircraft Engines | Grille d’inverseur de poussée incluant un traitement acoustique |
EP3851651B1 (fr) * | 2020-01-17 | 2024-03-06 | Dicosy AG | Dispositif de lancement de jet de pulvérisation à entraînement à jet de buse |
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- 2011-06-09 EP EP11735460.5A patent/EP2580121B1/fr not_active Not-in-force
- 2011-06-09 BR BR112012031432A patent/BR112012031432A2/pt not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
FR2961175A1 (fr) | 2011-12-16 |
RU2563297C2 (ru) | 2015-09-20 |
US8757319B2 (en) | 2014-06-24 |
FR2961175B1 (fr) | 2013-01-04 |
BR112012031432A2 (pt) | 2016-11-08 |
US20130112497A1 (en) | 2013-05-09 |
RU2013100181A (ru) | 2014-07-20 |
CN102933462A (zh) | 2013-02-13 |
CA2802008A1 (fr) | 2011-12-22 |
EP2580121B1 (fr) | 2016-03-09 |
EP2580121A1 (fr) | 2013-04-17 |
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